Die for forming throat sheets for boilers



W. NEES Feb. ll, 1930.

DIE FOR FORMING` THROAT SHEETS FOR BGILERS Filed July 29. 1927 ssneetssneet 1 W lljllll llll I.| lVlllllll jm lit/21; w juge. s A

Feb. 11, 1930.

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Feb. 11, 1930.

w. NEEs 1,747,127 DIE FOR FORMING vIHROAT SHEETS FOR BOQIILERS l Filed`July 29. 1927 s sheets-sheet 5 fgff.

Patented Feb. 11, 1930 UNITED STATES WILLIAM NEES, F DREXEL HILL,PENNSYLVANA DIE FOR FORMING THEOAT SHEETS FOR BOILERS Application ledJuly 29,

My invention relates to certain improvements in the dies for pressingsheet met-al into the torni of throat sheets for boilers, etc.,particularly boilers of the locomotive type.

3 The broad idea of the invention, however, is fully described andclaimed in a copending application filed by me on the 8th day of J une,1927, under Serial No. 197,496.

The object of the present invention is to la improve the dies for makingthe internal throat sheet of a locomotive boiler, the sheet being ofconsiderable length and which in the present instance has an expansioncorrugation formed therein to allow for the eXpan- 15 sion andcontraction of the boiler.

In the accompanying drawings:

Fig. 1 is a side view of the upper and lower dies for forming theinternal throat sheet of a locomotive boiler;

Fig. 2 is a face view of the upper die;

Fig. 3 is a face view of the lower die;

Fig. 4 is a sectional plan view on the line 4 4, Fig. 2, of the upperand lower dies showing the method of forming the expansion corrugation;

Figs. 5, 6 and 7 are detached end views of the dilerent nose sections;and

Fig. 8 is a perspective view of the flanged end of the inner throatsheet of a locomotive ff boiler.

lVhile my invention is particularly adapted for use in forming thethroat sheets of locomotive boilers, particularly the inner throatsheet, it will be understood that it can be used for forming flanges onthe ends of other semicylindrical plates without departing from theessential features of the invention.

2 is the lower die shaped as shown in Figs. l and 3, it being made intwo parts in the present instance. The cavity in the die issemi-cylindrical in form to correspond t0 the shape of a segmentalportion of the tube sheet. The die is flared and so shaped as to formthe main flange Z and side flanges c e. 4f The throat sheet iscorrugated as at f-f, directly back of the flange cl so as to allow forexpansion and contraction, and the lower die has a projecting rib 3 ateach side, which is tapered as shown and coincides with a groove 4 inthe upper die 5. The front end 6 of the 1927. Serial No. 209,311.

lower die is at right angles to the inclined portion 7 of the die andthe two surfaces are connected by the curved section 8 of the radiusshown.

The upper die is shaped as shown in Figs. 1 and 2, and the front end ofthe die has two pairs of ribs 14-14 spaced apart and centrally locatedribs 16-16- The body portion of the die 5 also has'side `flanges 17. Theflanges 14-14 are spaced apart to receive the extensions 10 of the nosesection 9a of the upper die, which, in the present instance, is made intwo sections, and the ribs -16 are spaced apart to receive the portions11 of the upper die.

' The extensions 1010 are secured tol the flanges 14 lby bolts 15, whilethe extensions 11 are secured to the flanges 16 by bolts 18. Bolts 19secure the horizontal flanges of the nose section to the anges on thebody portionorn the upper die, while bolts 20 secure the inclinedflanges ofthe two parts together. This construction is very vsubstantialand one which will allow for the removal of one size nose section andthe placing of a different sized nose section.

ln making the throat sheet as shown in ig. 8, various operations arenecessary and lil'erent lengths of nose pieces are provided. The nosepiece shown in Fig. 5 is short and is for the first operation. The nosepiece shown in Fig. 6 is of medium length and is for the secondoperation, while the nose piece shown in Fig. 7 is of full length and isused on the third operation for finishing the bending of the flange. Y

It will be understood that the body of the threat sheet is bent to theproper curve by ordinary bending rolls, and the dies abovedescribed areused only to form the flanges on the ends ofthe throat sheet and to formthe diminishing corruga-tions on the throat sheet back of the flanges. twill also be understood that in the shaping of the upper and lower diesto form the throat sheet, the expansion joints may be omitted where ajoint 1s unnecessary.

By removing the bolts 15, 19 and 20, the nose piece sections 9a can bedetached from the body portion of the upper die and other sections canbe substituted therefor, by simply using an overhead 'crane which liftsone section out of position and moves another section into position.

It will be realized that the dies are extremely heavy, and even the nosesection to be adjusted properly is more than a man can handle. The nosepiece can also be detached from the body of the die when it is foundunnecessary owing to the peculiar tliroatrsheet or other forni to removethe formed blank from the dies without raising the upper die to itsextreme height.

The invention is likewise particularly f' adaptedfor use in connectionwith standard presses having their given lifts.

I claim:

1. The combination inl an upper' diev for forming throat sheets oflocomotive boilers and the like, said upper die having three sets ofspaced ribs at one end, Oia nose piece made in two sections, eachsectionhaving extensions adapted to the spaces between the ribs of the upperdie, both the die and no se piece having horizontal and angular ribs:bolts securing the ribs of one section to the other section; and boltssecuring the extensions of the nose piece to the ribs of the upper die'.

2. The combination of a lower die having a recess formed therein, andhaving an inclined portion against which a flange is formed, and aninwardly projecting tapered rib on the lower die; and an upper diehaving a nose piece and grooved at eachside t-o receive the taperedprojecting rib which will form corrugations in a throat sheet directlyback of its ange. y Y

WILLIAM NEES.

